#
#   Licensed under the Apache License, Version 2.0 (the "License"); you may
#   not use this file except in compliance with the License. You may obtain
#   a copy of the License at
#
#        http://www.apache.org/licenses/LICENSE-2.0
#
#   Unless required by applicable law or agreed to in writing, software
#   distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
#   WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
#   License for the specific language governing permissions and limitations
#   under the License.
#

"""Volume v2 snapshot action implementations"""

import copy
import functools
import logging

from cliff import columns as cliff_columns
from osc_lib.cli import format_columns
from osc_lib.cli import parseractions
from osc_lib.command import command
from osc_lib import exceptions
from osc_lib import utils

from openstackclient.common import pagination
from openstackclient.i18n import _
from openstackclient.identity import common as identity_common


LOG = logging.getLogger(__name__)


class VolumeIdColumn(cliff_columns.FormattableColumn):
    """Formattable column for volume ID column.

    Unlike the parent FormattableColumn class, the initializer of the
    class takes volume_cache as the second argument.
    osc_lib.utils.get_item_properties instantiate cliff FormattableColumn
    object with a single parameter "column value", so you need to pass
    a partially initialized class like
    ``functools.partial(VolumeIdColumn, volume_cache)``.
    """

    def __init__(self, value, volume_cache=None):
        super(VolumeIdColumn, self).__init__(value)
        self._volume_cache = volume_cache or {}

    def human_readable(self):
        """Return a volume name if available

        :rtype: either the volume ID or name
        """
        volume_id = self._value
        volume = volume_id
        if volume_id in self._volume_cache.keys():
            volume = self._volume_cache[volume_id].name
        return volume


class CreateVolumeSnapshot(command.ShowOne):
    _description = _("Create new volume snapshot")

    def get_parser(self, prog_name):
        parser = super(CreateVolumeSnapshot, self).get_parser(prog_name)
        parser.add_argument(
            "snapshot_name",
            metavar="<snapshot-name>",
            help=_("Name of the new snapshot"),
        )
        parser.add_argument(
            "--volume",
            metavar="<volume>",
            help=_(
                "Volume to snapshot (name or ID) "
                "(default is <snapshot-name>)"
            ),
        )
        parser.add_argument(
            "--description",
            metavar="<description>",
            help=_("Description of the snapshot"),
        )
        parser.add_argument(
            "--force",
            action="store_true",
            default=False,
            help=_(
                "Create a snapshot attached to an instance. "
                "Default is False"
            ),
        )
        parser.add_argument(
            "--property",
            metavar="<key=value>",
            action=parseractions.KeyValueAction,
            help=_(
                "Set a property to this snapshot "
                "(repeat option to set multiple properties)"
            ),
        )
        parser.add_argument(
            "--remote-source",
            metavar="<key=value>",
            action=parseractions.KeyValueAction,
            help=_(
                "The attribute(s) of the existing remote volume snapshot "
                "(admin required) (repeat option to specify multiple "
                "attributes) e.g.: '--remote-source source-name=test_name "
                "--remote-source source-id=test_id'"
            ),
        )
        return parser

    def take_action(self, parsed_args):
        volume_client = self.app.client_manager.volume
        volume = parsed_args.volume
        if not parsed_args.volume:
            volume = parsed_args.snapshot_name
        volume_id = utils.find_resource(volume_client.volumes, volume).id
        if parsed_args.remote_source:
            # Create a new snapshot from an existing remote snapshot source
            if parsed_args.force:
                msg = _(
                    "'--force' option will not work when you create "
                    "new volume snapshot from an existing remote "
                    "volume snapshot"
                )
                LOG.warning(msg)
            snapshot = volume_client.volume_snapshots.manage(
                volume_id=volume_id,
                ref=parsed_args.remote_source,
                name=parsed_args.snapshot_name,
                description=parsed_args.description,
                metadata=parsed_args.property,
            )
        else:
            # create a new snapshot from scratch
            snapshot = volume_client.volume_snapshots.create(
                volume_id,
                force=parsed_args.force,
                name=parsed_args.snapshot_name,
                description=parsed_args.description,
                metadata=parsed_args.property,
            )
        snapshot._info.update(
            {
                'properties': format_columns.DictColumn(
                    snapshot._info.pop('metadata')
                )
            }
        )
        return zip(*sorted(snapshot._info.items()))


class DeleteVolumeSnapshot(command.Command):
    _description = _("Delete volume snapshot(s)")

    def get_parser(self, prog_name):
        parser = super(DeleteVolumeSnapshot, self).get_parser(prog_name)
        parser.add_argument(
            "snapshots",
            metavar="<snapshot>",
            nargs="+",
            help=_("Snapshot(s) to delete (name or ID)"),
        )
        parser.add_argument(
            '--force',
            action='store_true',
            help=_(
                "Attempt forced removal of snapshot(s), "
                "regardless of state (defaults to False)"
            ),
        )
        return parser

    def take_action(self, parsed_args):
        volume_client = self.app.client_manager.volume
        result = 0

        for i in parsed_args.snapshots:
            try:
                snapshot_id = utils.find_resource(
                    volume_client.volume_snapshots, i
                ).id
                volume_client.volume_snapshots.delete(
                    snapshot_id, parsed_args.force
                )
            except Exception as e:
                result += 1
                LOG.error(
                    _(
                        "Failed to delete snapshot with "
                        "name or ID '%(snapshot)s': %(e)s"
                    )
                    % {'snapshot': i, 'e': e}
                )

        if result > 0:
            total = len(parsed_args.snapshots)
            msg = _(
                "%(result)s of %(total)s snapshots failed " "to delete."
            ) % {'result': result, 'total': total}
            raise exceptions.CommandError(msg)


class ListVolumeSnapshot(command.Lister):
    _description = _("List volume snapshots")

    def get_parser(self, prog_name):
        parser = super(ListVolumeSnapshot, self).get_parser(prog_name)
        parser.add_argument(
            '--all-projects',
            action='store_true',
            default=False,
            help=_('Include all projects (admin only)'),
        )
        parser.add_argument(
            '--project',
            metavar='<project>',
            help=_('Filter results by project (name or ID) (admin only)'),
        )
        identity_common.add_project_domain_option_to_parser(parser)
        parser.add_argument(
            '--long',
            action='store_true',
            default=False,
            help=_('List additional fields in output'),
        )
        parser.add_argument(
            '--name',
            metavar='<name>',
            default=None,
            help=_('Filters results by a name.'),
        )
        parser.add_argument(
            '--status',
            metavar='<status>',
            choices=[
                'available',
                'error',
                'creating',
                'deleting',
                'error_deleting',
            ],
            help=_(
                "Filters results by a status. "
                "('available', 'error', 'creating', 'deleting'"
                " or 'error_deleting')"
            ),
        )
        parser.add_argument(
            '--volume',
            metavar='<volume>',
            default=None,
            help=_('Filters results by a volume (name or ID).'),
        )
        pagination.add_marker_pagination_option_to_parser(parser)
        return parser

    def take_action(self, parsed_args):
        volume_client = self.app.client_manager.volume
        identity_client = self.app.client_manager.identity

        if parsed_args.long:
            columns = [
                'ID',
                'Name',
                'Description',
                'Status',
                'Size',
                'Created At',
                'Volume ID',
                'Metadata',
            ]
            column_headers = copy.deepcopy(columns)
            column_headers[6] = 'Volume'
            column_headers[7] = 'Properties'
        else:
            columns = ['ID', 'Name', 'Description', 'Status', 'Size']
            column_headers = copy.deepcopy(columns)

        # Cache the volume list
        volume_cache = {}
        try:
            for s in volume_client.volumes.list():
                volume_cache[s.id] = s
        except Exception:
            # Just forget it if there's any trouble
            pass
        _VolumeIdColumn = functools.partial(
            VolumeIdColumn, volume_cache=volume_cache
        )

        volume_id = None
        if parsed_args.volume:
            volume_id = utils.find_resource(
                volume_client.volumes, parsed_args.volume
            ).id

        project_id = None
        if parsed_args.project:
            project_id = identity_common.find_project(
                identity_client,
                parsed_args.project,
                parsed_args.project_domain,
            ).id

        # set value of 'all_tenants' when using project option
        all_projects = (
            True if parsed_args.project else parsed_args.all_projects
        )

        search_opts = {
            'all_tenants': all_projects,
            'project_id': project_id,
            'name': parsed_args.name,
            'status': parsed_args.status,
            'volume_id': volume_id,
        }

        data = volume_client.volume_snapshots.list(
            search_opts=search_opts,
            marker=parsed_args.marker,
            limit=parsed_args.limit,
        )
        return (
            column_headers,
            (
                utils.get_item_properties(
                    s,
                    columns,
                    formatters={
                        'Metadata': format_columns.DictColumn,
                        'Volume ID': _VolumeIdColumn,
                    },
                )
                for s in data
            ),
        )


class SetVolumeSnapshot(command.Command):
    _description = _("Set volume snapshot properties")

    def get_parser(self, prog_name):
        parser = super(SetVolumeSnapshot, self).get_parser(prog_name)
        parser.add_argument(
            'snapshot',
            metavar='<snapshot>',
            help=_('Snapshot to modify (name or ID)'),
        )
        parser.add_argument(
            '--name', metavar='<name>', help=_('New snapshot name')
        )
        parser.add_argument(
            '--description',
            metavar='<description>',
            help=_('New snapshot description'),
        )
        parser.add_argument(
            "--no-property",
            dest="no_property",
            action="store_true",
            help=_(
                "Remove all properties from <snapshot> "
                "(specify both --no-property and --property to "
                "remove the current properties before setting "
                "new properties.)"
            ),
        )
        parser.add_argument(
            '--property',
            metavar='<key=value>',
            action=parseractions.KeyValueAction,
            help=_(
                'Property to add/change for this snapshot '
                '(repeat option to set multiple properties)'
            ),
        )
        parser.add_argument(
            '--state',
            metavar='<state>',
            choices=[
                'available',
                'error',
                'creating',
                'deleting',
                'error_deleting',
            ],
            help=_(
                'New snapshot state. ("available", "error", "creating", '
                '"deleting", or "error_deleting") (admin only) '
                '(This option simply changes the state of the snapshot '
                'in the database with no regard to actual status, '
                'exercise caution when using)'
            ),
        )
        return parser

    def take_action(self, parsed_args):
        volume_client = self.app.client_manager.volume
        snapshot = utils.find_resource(
            volume_client.volume_snapshots, parsed_args.snapshot
        )

        result = 0
        if parsed_args.no_property:
            try:
                key_list = snapshot.metadata.keys()
                volume_client.volume_snapshots.delete_metadata(
                    snapshot.id,
                    list(key_list),
                )
            except Exception as e:
                LOG.error(_("Failed to clean snapshot properties: %s"), e)
                result += 1

        if parsed_args.property:
            try:
                volume_client.volume_snapshots.set_metadata(
                    snapshot.id, parsed_args.property
                )
            except Exception as e:
                LOG.error(_("Failed to set snapshot property: %s"), e)
                result += 1

        if parsed_args.state:
            try:
                volume_client.volume_snapshots.reset_state(
                    snapshot.id, parsed_args.state
                )
            except Exception as e:
                LOG.error(_("Failed to set snapshot state: %s"), e)
                result += 1

        kwargs = {}
        if parsed_args.name:
            kwargs['name'] = parsed_args.name
        if parsed_args.description:
            kwargs['description'] = parsed_args.description
        if kwargs:
            try:
                volume_client.volume_snapshots.update(snapshot.id, **kwargs)
            except Exception as e:
                LOG.error(
                    _("Failed to update snapshot name " "or description: %s"),
                    e,
                )
                result += 1

        if result > 0:
            raise exceptions.CommandError(
                _("One or more of the " "set operations failed")
            )


class ShowVolumeSnapshot(command.ShowOne):
    _description = _("Display volume snapshot details")

    def get_parser(self, prog_name):
        parser = super(ShowVolumeSnapshot, self).get_parser(prog_name)
        parser.add_argument(
            "snapshot",
            metavar="<snapshot>",
            help=_("Snapshot to display (name or ID)"),
        )
        return parser

    def take_action(self, parsed_args):
        volume_client = self.app.client_manager.volume
        snapshot = utils.find_resource(
            volume_client.volume_snapshots, parsed_args.snapshot
        )
        snapshot._info.update(
            {
                'properties': format_columns.DictColumn(
                    snapshot._info.pop('metadata')
                )
            }
        )
        return zip(*sorted(snapshot._info.items()))


class UnsetVolumeSnapshot(command.Command):
    _description = _("Unset volume snapshot properties")

    def get_parser(self, prog_name):
        parser = super(UnsetVolumeSnapshot, self).get_parser(prog_name)
        parser.add_argument(
            'snapshot',
            metavar='<snapshot>',
            help=_('Snapshot to modify (name or ID)'),
        )
        parser.add_argument(
            '--property',
            metavar='<key>',
            action='append',
            default=[],
            help=_(
                'Property to remove from snapshot '
                '(repeat option to remove multiple properties)'
            ),
        )
        return parser

    def take_action(self, parsed_args):
        volume_client = self.app.client_manager.volume
        snapshot = utils.find_resource(
            volume_client.volume_snapshots, parsed_args.snapshot
        )

        if parsed_args.property:
            volume_client.volume_snapshots.delete_metadata(
                snapshot.id,
                parsed_args.property,
            )
